Determining signal transition times over data communications path enables accurate measurement of transition time or path length without great cost - involves evaluating period or frequency of oscillations arising from transmitting signal in both directions with inversion in one communications device

摘要

The method involves inverting the signal received by the first device (1) over the second communications line (4) and transmitting the inverted signal on the first line (3), transmitting the signal received by the second device (2) via the first line (3) unchanged over the second line (4) and determining the transition time or path length (x) from the physical characteristics, e.g. the period or frequency, of the adapted oscillations.